Electric heater.



L. P. PARKHURST.

ELECTRIC HEATER. APPLIGATION FILED APR. ze, 1909.

1,028,383. Patented June 4, 1912.

2 SHEETS-SHEET 1.

ATTY- L. P. PARKHURST. BLEGTRIGHEATBR. APPLICATION FILED APR.26, 1909. 1,028,383, 'Patented June 4, 1912.

2 SHEETS-SHEET 2.

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Inventor: Leon Fparkh Liv-stJ @Mmg UNITED sTATEs PATENT oEErcE.

LEON F. PARKHURST, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION 0F NEW YORK.

ELECTRIC HEATER.

Specification of Letters Patent.

Patented June 4, 1912.

Application filed April 26, 1909. Serial No. 492,410.

To all whom it may concern:

Be it known that ILEoN F. PARKHURST, a citizen of the United States, residing at Pittsfield, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Electric Heaters, of which the following is a specification.

This invention relates to electric heaters and has for its object the provision of means whereby the heating unit is resiliently or yieldingly held in Contact with the body to be heated, so as to overcome the detrimental effect upon the thermal relation between the unit and the body to be heated, due to eX- pansion.

In carrying out my invention, I provide in connection with the body to be heated and a heating unit, which may be of the flat type, resilient clamping means for securing the unit to the body. A spring clamp or fastener is provided, which, while holding the parts in thermal relation, provides for a yielding contact to enable the `parts to eX- pand.

In the accompanying drawings, in which I have shown my invention embodied in two different forms for purposes of illustration, Figure 1 represents a view partly in section, of a iuid receptacle having my invention applied thereto; Fig. 2 represents a disassembled view of the parts; Fig. 3 represents a plan view of the base equipped with my spring clamping arrangement; Fig. 4: represents an elevation of another form of i my invention; Fig. 5 represents a sectional enlarged view of the same; and Flg. 6 a

fragmentary plan view.

Referring to the drawings, 10 represents a fluid receptacle which may be of any desired shape and material, such, for instance, as the shape shown in Fig. 1, made'of aluminum. The bottom of this receptacle has secured to it a cup-shaped member 11, hav-Y ing screw-threaded corrugations 12. Thls member 11 may be in the nature of a reinforcing plate and secured to the bottom by brazing or similar method as described in the manner disclosed in the patent to E. F. Shailer and O. D. Storer, No. 1,006,692. This cup-shaped member 11 is adapted to receive aheating unit 13 which is secured in yielding contact with the bottom of the receptacle by means of the base 14, which forms a clamping device. This base consists of a cup-shaped member similar to member" 11 screw-threaded to engage the threads 12 and adapted to screw over the member 11. The bottom of this member, which engages the heating unit, is provided with spring lugs 15, which are struck up from the base by expanding the metal, as shown. I have shown three of these lugs to engage the bottom, although it is evident that any number may be provided and it is also evident that they may be constructed in any desired manner. Then the base is secured on to the member 11, the lugs press the heating unit int-o engagement with the bottom of the receptacle with a yielding pressure, so that the unit will be in good thermal relation with the bottom of the receptacle, regardless of any expansion which may occur.

Figs. 4, 5, and 6 show my invention in a slightly modified form. In this case, as above, the reinforcing plate 16 is secured tc the bottom of the receptacle, but the spring member in this case is a separate piece secured to the bottom of the heating unit and may therefore be of selected material to retain its elasticity under repeated heating. This member 17 has substantially the same length as the diameter of the heating unit and is pivoted at its middle portion to the center of the heating unit. This strip is a spring metal and is concaved away from the unit, as shown. Lugs 1S are riveted to the flange of the member 1G at opposite'sides thereof, so as to engage the spring strip 17. This unit is clamped in place by forcing the member into the lugs 18, so as to place the spring 17 under tensionand may be removed by turning the member on its pivot and releasing it from the lugs.

I/Vhile I have shown my inven lon as embodied in concrete structure for purposes of illustration, it should be understood that I do not. limit my invention thereto, since various modiications will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. An electric heater comprising a body to be heated, a flat heating unit located beneath the said body and resilient means for securing the unitfto the body. v

2. An electric heater comprising a body to be heated, a flat heating unit located beneath the said body and a spring clamp for securing the unit to the body.

3. An electric heater comprising a fluid receptacle, an auxiliary member rigidly secured to the bottom of said receptacle to reinforce the same, a fiat heating unit and means including a resilient device for securing the unit to said member. y

4 An electric heater comprising -a fluid receptacle, a flat heating unlt and yielding clamping means for securing the unit to the bottom of said receptacle.

5. -An electric heater comprising a fluid receptacle having a reinforced bottom, a flat heating unit and a resilient device for` securing the heating unit to said bottom.

6. An electric heater comprising a body to be heated, a heating unit located beneath the said body and resilient means for yieldingly securing the effective heating surface of the unit to the body.

7. An electric heater comprising a fluid receptacle, a heating unit and means for yieldingly securing the effect-ive heating surface of the unit to the bottom of said receptacle.

8. An electric heater comprising a Huid receptacle having a reinforced bottom, a heating unit, and resilient clamping means for yieldingly securing the effect-ive heating surface of the unit to said bottom. l

In Witness whereof, I have hereunto set my hand this thirty-first day of March, 1909-.

LEN F. PARKHURST.

Witnesses:

HARRY G. WEEKS, W. H. LoCKWoon. 

